Delete secondary cats, or resonator, or both?
Thread Starter
Member
Joined: May 2014
Posts: 104
Likes: 2
C63
Delete secondary cats, or resonator, or both?
I recently picked up a 2010 C63. It has MHP longtube headers and stock exhaust otherwise. Previous owner thought it was too loud so he had Magnaflow hi-flow cats installed after the resonators, in an area where I'm assuming the stock secondary cats would normally be.
I politely disagree with the previous owner, and think the car needs to be louder. I can't decide if I should delete the secondary cats, or the resonator, or both. I am going to guess that a C63 with headers, no resonator, and no cats would just be obnoxiously loud. I'm probably not going to go that route.
Which would give me the best bang for the buck if I have to decide which to delete between the resonator and the cats? I am worried that just deleting the hi-flow cats won't add much noise. Definitely need a decent bump up in the exhaust noise either way. Thanks.
I politely disagree with the previous owner, and think the car needs to be louder. I can't decide if I should delete the secondary cats, or the resonator, or both. I am going to guess that a C63 with headers, no resonator, and no cats would just be obnoxiously loud. I'm probably not going to go that route.
Which would give me the best bang for the buck if I have to decide which to delete between the resonator and the cats? I am worried that just deleting the hi-flow cats won't add much noise. Definitely need a decent bump up in the exhaust noise either way. Thanks.
Senior Member
Joined: Jun 2014
Posts: 272
Likes: 4
C63
Delete secondary cats with an xpipe to balance those long tube headers. Personally, I would delete the resonator and add an akrapovic slip on. That way, you shave weight and it will sound scary, but the axle back will refine the setup. Stock mufflers are way to loud to delete everything.
Senior Member
Joined: Oct 2012
Posts: 407
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From: Honolulu, HI
2011 MB C63 AMG. 2014 MUSTANG COVERTIBLE V6. 2010 MUSTANG CONVERTIBLE V6.
right now i have stock headers. but no res and no 2nd cat. both replaced by straight pipes. sounds absolutely monstrous. I'm sure a full block or 2 radius can hear your car on acceleration. may be a bit too loud for some people. so i could only imagine w/ aftermarket headers it would only be louder. i love how loud my car is now though definitely turns heads & scares the fk out of ppl sometimes.
PLATINUM SPONSOR
Joined: Jun 2008
Posts: 3,834
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From: Texas
2003 CL55
Delete the resonator first and see what you think, then go to cats..
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E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
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E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.
www.ultimatepd.com
instagram @ultimate_pd
facebook.com/ultimatepd
MBWorld Fanatic!
Joined: Mar 2011
Posts: 1,601
Likes: 10
From: San Diego/San Francisco
AMG GLC63. Audi R8
The secondary cats add back pressure and reduce flow. The resonator is completely flow through. Keeping it or deleting it is just a matter of sound preference. It makes no difference in performance.
Super Member
Joined: Jun 2012
Posts: 706
Likes: 2
From: Boca Raton
2012 Diamond White C63 Coupe
right now i have stock headers. but no res and no 2nd cat. both replaced by straight pipes. sounds absolutely monstrous. I'm sure a full block or 2 radius can hear your car on acceleration. may be a bit too loud for some people. so i could only imagine w/ aftermarket headers it would only be louder. i love how loud my car is now though definitely turns heads & scares the fk out of ppl sometimes.
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Super Member
Joined: Jun 2012
Posts: 706
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From: Boca Raton
2012 Diamond White C63 Coupe
I personally did a straight pipe res delete, but if you ask 10 people 5 of them will say x-pipe and 5 will say straight pipes, it is honestly going to be just up to you at the end.
Senior Member
Joined: Oct 2012
Posts: 407
Likes: 1
From: Honolulu, HI
2011 MB C63 AMG. 2014 MUSTANG COVERTIBLE V6. 2010 MUSTANG CONVERTIBLE V6.
Yup it all comes down to your preference whether you want it ridiculous loud. Or just loud. Ridiculous loud being full straight pipes.
